|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
11/08/2023 |
Data da última atualização: |
11/08/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SANTOS, A. L. dos; AMARAL, Á. L. S. do; SOUZA, C. R. S.; BATISTA, D. C.; PARIS, E. C.; FIGUEIREDO, A. T. de; GIRALDI, T. R. |
Afiliação: |
ELAINE CRISTINA PARIS, CNPDIA. |
Título: |
Influence of structural and surface properties of Nb2O5 pellets on methylene blue adsorption and adsorbent reuse capacity. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Cerâmica, v. 69, 2023. |
Páginas: |
133 - 140 |
DOI: |
http://dx.doi.org/10.1590/0366-69132023693903426 |
Idioma: |
Inglês |
Conteúdo: |
This study aimed to describe the preparation of Nb2O5 pellets by uniaxial pressing, to investigate the influence of heat treatment at different temperatures (800, 900, and 1000 °C) on the physical, surface, microstructural, and adsorptive properties of the materials, and to assess their potential as reusable adsorbents for methylene blue removal. Specimens treated at 800 °C contained a mixture of monoclinic and hexagonal phases, with a predominance of monoclinic structures. By contrast, heat treatment at 900 °C and above resulted in complete conversion to the monoclinic phase. The surface of Nb2O5 particles contained basic groups, possibly oxygen ions (O-). Experimental investigations showed that methylene blue adsorption followed second-order kinetics, suggesting chemical diffusion as the dominant process. Maximum adsorption occurred at pH 6.0. Pellets remained intact after the adsorption test. A study was carried out to determine the reusability of pellets over five adsorption cycles in methylene blue solutions at different concentrations. The maximum adsorbed concentration was 10.4 mg.L-1. The adsorption capacity of Nb2O5 specimens gradually decreased from 56% in the first cycle to 25% in the fifth cycle. Despite this reduction in removal efficiency, Nb2O5 pellets showed promise as reusable adsorbents in heterogeneous processes because of their high potential adsorption capacity and easy separation from the reaction medium. |
Palavras-Chave: |
Niobium pentoxide; Reuse. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02198naa a2200241 a 4500 001 2155873 005 2023-08-11 008 2023 bl uuuu u00u1 u #d 024 7 $ahttp://dx.doi.org/10.1590/0366-69132023693903426$2DOI 100 1 $aSANTOS, A. L. dos 245 $aInfluence of structural and surface properties of Nb2O5 pellets on methylene blue adsorption and adsorbent reuse capacity.$h[electronic resource] 260 $c2023 300 $a133 - 140 520 $aThis study aimed to describe the preparation of Nb2O5 pellets by uniaxial pressing, to investigate the influence of heat treatment at different temperatures (800, 900, and 1000 °C) on the physical, surface, microstructural, and adsorptive properties of the materials, and to assess their potential as reusable adsorbents for methylene blue removal. Specimens treated at 800 °C contained a mixture of monoclinic and hexagonal phases, with a predominance of monoclinic structures. By contrast, heat treatment at 900 °C and above resulted in complete conversion to the monoclinic phase. The surface of Nb2O5 particles contained basic groups, possibly oxygen ions (O-). Experimental investigations showed that methylene blue adsorption followed second-order kinetics, suggesting chemical diffusion as the dominant process. Maximum adsorption occurred at pH 6.0. Pellets remained intact after the adsorption test. A study was carried out to determine the reusability of pellets over five adsorption cycles in methylene blue solutions at different concentrations. The maximum adsorbed concentration was 10.4 mg.L-1. The adsorption capacity of Nb2O5 specimens gradually decreased from 56% in the first cycle to 25% in the fifth cycle. Despite this reduction in removal efficiency, Nb2O5 pellets showed promise as reusable adsorbents in heterogeneous processes because of their high potential adsorption capacity and easy separation from the reaction medium. 653 $aNiobium pentoxide 653 $aReuse 700 1 $aAMARAL, Á. L. S. do 700 1 $aSOUZA, C. R. S. 700 1 $aBATISTA, D. C. 700 1 $aPARIS, E. C. 700 1 $aFIGUEIREDO, A. T. de 700 1 $aGIRALDI, T. R. 773 $tCerâmica$gv. 69, 2023.
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Instrumentação (CNPDIA) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
22/06/1999 |
Data da última atualização: |
22/11/2019 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
MAUÉS, M. M.; OLIVEIRA, F. C. de. |
Afiliação: |
MARCIA MOTTA MAUES, CPATU; MESTRANDA INPA. |
Título: |
Fenologia reprodutiva e entomofauna polinizadora da castanheira-do-brasil (Bertholletia excelsa Humb & Bonpl., Lecythidaceae) na Amazônia Oriental. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
In: CONGRESSO DE ECOLOGIA DO BRASIL, 4., 1998, Belém, PA. Ecossistemas: com enfoque em seus componentes básicos: resumos. Belém, PA: FCAP: Sociedade de Ecologia do Brasil, 1998. |
Páginas: |
p. 121. |
Idioma: |
Português |
Palavras-Chave: |
Brasil; Castanha do brasil. |
Thesagro: |
Bertholletia Excelsa; Fenologia; Fruta; Inseto Polinizador. |
Thesaurus NAL: |
Amazonia; Brazil nuts; fruits; phenology; pollinators. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/205250/1/Fenologia-reprodutiva-e-entomofauna.pdf
|
Marc: |
LEADER 00880nam a2200253 a 4500 001 1398981 005 2019-11-22 008 1998 bl uuuu u00u1 u #d 100 1 $aMAUÉS, M. M. 245 $aFenologia reprodutiva e entomofauna polinizadora da castanheira-do-brasil (Bertholletia excelsa Humb & Bonpl., Lecythidaceae) na Amazônia Oriental. 260 $aIn: CONGRESSO DE ECOLOGIA DO BRASIL, 4., 1998, Belém, PA. Ecossistemas: com enfoque em seus componentes básicos: resumos. Belém, PA: FCAP: Sociedade de Ecologia do Brasil$c1998 300 $ap. 121. 650 $aAmazonia 650 $aBrazil nuts 650 $afruits 650 $aphenology 650 $apollinators 650 $aBertholletia Excelsa 650 $aFenologia 650 $aFruta 650 $aInseto Polinizador 653 $aBrasil 653 $aCastanha do brasil 700 1 $aOLIVEIRA, F. C. de
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Expressão de busca inválida. Verifique!!! |
|
|